Eastern Veil (NGC 6992) from POSS2 red & blue data (Göran Nilsson)

Eastern Veil (NGC 6992) from POSS2 red & blue data

Here is an RGB image from the monochrome glass plate images (taken through a red and a blue filter) from the Palomar Observatory Sky Survey II (1990ties) downloaded from the Mikulski Archives site. They used the Oschin 48-inch (1.2-m) Schmidt camera on the Mt Palomar Obsy. Here I used both red and blue data and made a synthetic green (a 50:50 mix of red and blue) to make a RGB image. Much of the work in this case went into aligning stars since the red and blue did not match up perfectly over the whole image, so I had to divide it up into 6 squares where I aligned the colour channels. All done in PS.

I think there is some very nice details in the data and tight stars, but I get the feeling that the dynamic range of these glass plates is not as high as in our modern 16bit digital images, so it is not possible to bring out as much dust as we are getting used to.

Original
Final
B

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Status	Basic failed
Started	...
Astrometry.net job	1453248
PixInsight job	n/a
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